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(A, C, E) Original and (B, D, F) background subtracted voltammograms recorded at CDH variant (A-B) T680C, (C-D) E653C and (E-F) D792C modified GC/MWCNT electrodes, in argon-saturated 50 mM acetate buffer (pH 5.5), containing 30 mM CaCl2 and different concentrations of D-glucose from 0 to 200 mM, scan rate 1 mV/s.
